How can PHP developers effectively manage external dependencies and tools for network scanning?

PHP developers can effectively manage external dependencies and tools for network scanning by using a package manager like Composer to handle the installation and updates of necessary libraries. By defining dependencies in a composer.json file and running `composer install`, developers can easily manage and update the required tools for network scanning.

// composer.json
{
    "require": {
        "vendor/package": "^1.0"
    }
}
```

// Run `composer install` to install the dependencies
```bash
composer install